5 replies to this topic

[babsbrown]

Evening guys, i have a 998 mini city that has a stage 1 kit.the kit itself was bought a part at a time and not as a full kit. When the car is running, she splutters and fires fuel out the carb and airfilter. It will stay running. When fitting the back box, the pipe was 1.5" which i connected to a 1.75" system. I have my suspicions that this hasnt seeled correctly as its awfully loud towards the rear of the car. As if i had fitted a chavy cherry bomb or something. So my question is..... can a blowing exhaust cause a splutter/carb back fire? My logic being if its getting air in making the mixture too lean it will start to splutter?

Any advice is much appreciated.thanks in advance Luke

[ukcooper]

easy way check if the exhaust is blowing, put a decent glove on, put over the exhaust tail end and it should cut out the engine, if it dose not then it leaking.

Yours im guessing needs r/roading as it be the wrong needle I guess. if you ever change anything it needs to be re r/roaded.

[Dusky]

Mixture getting to weak thru the EXHAUST pipe...
Reduced backpressure can cause a car to perform bad, also changing anything exhaust wise will make the need to retune the carb and ignition.

[Ethel]

Leaky exhausts can admit air which combusts with unburnt fuel in the exhaust. 4 Stroke engines don't need back pressure, but it could alter the air-fuel ratio etc.

[babsbrown]

Cheers guys, I will test the exhaust tomorrow with a glove and test for leaks. I need to get it rolling roaded but need to get it to drive at least there to get it properly tuned. Can the timing cause the splutter?

[Dusky]

A lot of things can. Even too thick dashpot oil can cause it.
4 strokes don't need backpressure? Haha.

Edited by Dusky, 08 July 2016 - 08:33 AM.